Machine for grinding curved work.



No. 737,396. PATENTED AUG. 25, 1903. C. L. GOBHRING & W. TROGHE. MACHINE FOB. GRINDING GURVED WORK.

APPLICATION FILED JULY 24, 1902.

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I No. 737,396. PATENTED AUG. 25, 1903.

G. L. GOEHRING & W. TROGI-IE.

MACHINE FOR GRINDING GURVED WORK.

APPLIOATION FILED JULY 24, 1902.

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MACHINE FOR GRINDING CURVED WORK.

APPLICATION FILED JULY 24, 1902.

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G. L. GOEHRING W. TROGHE. MACHINE FOR GRINDING GURV BD WORK.

APPLIOATION FILED JULY 24, 1902.

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UNlTED STATES iatented August 25, 1903.

PATENT ()FFICE.

CHARLES L. GOEHRING AND WILLIAM TROCHE, OFAKRON, OHIO; SAID TROGHE ASSIGNOR TO SAID GOEHRING.

MACHINE FOR GRINDING CURVED WORK.

EPECIFICATION forming part of Letters Patent No. 737,396, dated August 25, 1903. Application filed July 24,1902. Serial No. 116.805. (No model.)

To rtZZ whom it may concern:

Beit known that we, CHARLES L. GoEHRING and WILLIAM TROOHE, citizens of the United States, residing at Akron, in the county of Summit, State of Ohio, have invented certain new and useful Improvements in Machines for Grinding Curved Work; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanyingdrawings, forming a part of this specification, and to the letters of reference marked thereon.

This invention relates to improvements in apparatus designed for beveling plates, especially glass and equivalent material, and more particularly elliptical,round,or curved plates, the objects of the invention being to providean apparatus which will be, as far as practicable, automatic in action, rapid, and capable of grinding a true bevel of definite and uniform width on an elliptical or oval plate.

The invention consists, primarily, in an apparatus for grinding ellipses or irregular curves in which the cutting-surface on the grinder is caused to maintain a definite and uniform relation to the shifting center of the work and regardless of the shifting of the cutting-surface due to the shifting of said center and thickness of the grinder.

The invention further consists in certain novel details of construction and combinations and arrangements of parts, all as will be now described, and pointed out particularly in the appended claims.

Referring to the accompanying drawings, Figure 1 is a side elevation of an apparatus embodying the present invention and designed for beveling elliptical or round plates. Fig. 2 is a view looking at the opposite side of the machine. Fig. 3 is a front elevation with the work-holder removed. Fig. 4 is a top plan view. Fig. 5 is a view of the gearing for moving the grinder and rotating the work in grinding ellipses or irregular shapes. Fig. 6 is a top plan view of the slide and adjustable eccentric for the work-holder. Figs. 7 and 8 are top and edge views of the adjustable eccentric alone. Figs. 9 and 10 are top and side views of the rotary head. Figs. 11 and 12 are top and side views of the slide.

Similar letters of reference in the several figures indicate the same parts.

The main frame of the machine, lettered A in the accompanying drawings, is preferably of metal and of suitable shape to support the working mechanism of the whole apparatus. At the bottom it is preferably provided with an extended base A and on the rear side near the top with a rearwardly-extending bracket A for supporting the bearings of the grinder or stone frame, as will be presently described. At the front the main frame is provided with vertically-extending ways or guides A adapted for cooperation with a vertically-movable bracket B, which constitutes the base of the work-support and is moved vertically by means of a screw 0, held in hearings on the main frame and adapted to be rotated by hand or power, as will be presently explained.

The bracket D, in which the frameE for the grinder is directly pivoted, is adjustably mounted on the bracket A and is adapted to be adjusted horizontally by the screw (1 and hand-wheel d, as is'usual in this class of machinery. The said frame E is mounted to swing on a transverse shaft E, journaled in the bracket D, and has fast and loose pulleys E thereon, to which the driving power is applied. The grinder or stone F is mounted rigidly on a shaft F, carried in bearings Q, movably supported at the forward end of the frame E, and is adapted to be rotated by a driving-gear, preferably consisting of a pair of sprocket-wheels f e and mounted, respectively, on the shafts E and F and having a sprocket-chain connecting them, as shown in Figs. 1 and 2. To limit the downward movement of the frame E and stone, a limitingbracket G extends upwardly from the frame A, and upon this limiting-bracket a set-screw G on the frame E is adapted to rest. Thus by adjusting the said set-screw G the downward limit of movement of the stone maybe gaged with the greatest accuracy. In operation it is designed that the stoneshall occupy a fixed position vertically, or, in other words, it does not ride on the work being done, but is held against vertical movement and the work is fed tothe stone, and in order that the stone may be elevated to facilitate the ing efiected by a screw b.

- B -passes through a slot in the eccentric andv inits upper face is provided with slidewaysbefore stated, the work is application of the work or the changing of the position of the work the frame E is provided with a downwardly-extending vertically-adjustable bracket G on the end or straight surface of which a roller or pair of rollers g, carried in the ends of crank-arms g, is or are adapted to work. Said crankarms g are mounted on a transverse shaft or center 9 journaled on a bracket 9 of the main frame, and they are adapted to be turned to raise the stone and frame E, first, by means of a counterweight H pivotally supported on the base of the machine and connected to one of the crank-arms by a link h, and, secondly, by means of alink H, extending downwardly and connected at its lower end with a handle H projecting at the front of the machine in convenient reach of the attendant. The attendant may thus by depressing or raising the handle raise or lower the stone, and the arrangement is preferably such that when the stone is depressed until the adjustable stop G rests on the bracket G it will be locked in that position. This result is attained by providing a second crank-arm H for operation by the handle H which second crank-arm extends vertically and is provided at its upper end with a roller H adapted to take over a cam or curved surface H on the bracket G Thus when the outer end of the handle H is depressed and its inner end raised the first effect is to move the roller H away from over the bracket G2 and then to elevate the frame E through vthe medium of the roller g, which contacts with the bottom face of the bracket G In lowering the stone to working position again the roller H is moved back over the top of the bracket G and locks the stone firmly in its adjusted p0- .sition. The vertical adjustment of the bracket As carried by the bracket B, which is vertically adjustable on the main frame, and in order to provide for an angular adjustment the upper portion 13 of the bracket is pivotally mounted in bearings b, held in adjusted position by a segment I), Fig. 1. Extending up through the bracket B is a rotary head 13 having a vertical axis and adapted to be rotated by a shaft H, sup- G is effected by means of a screw H ported in suitable bearings and having an.

axis coincident with the axis on which the bracket B pivots, the connection between the shaft H and rotary head B being formed by miter-gears it. Thus said head may be ro-' tated with the bracket in any desired angular adjustment.

On the bracket B is an adjustable eccen-- tric B Figs. 7 and 8, preferably guided in right lines toward and from the grinder by being mounted in ways b the adjusting be- The rotary head 6 adapted for the reception of .a slide having a central stud b, on which the support B for the work is mounted. The slide B is provided with downwardly-extending projections B embracing the eccentric. Thus as the head is rotated the slide and work will also be rotated and also moved toward and away from the grinder twice during each revolution. The adjustment of the eccentric determines the length of the ellipse or oval, and if it be adjusted to a concentric position thework will be' rotated on a fixed center and the stone will grind a round instead of an ellipse or oval. The work is preferably fed positively to the grinder or stone by elevating the bracket B, which carries the entire work-support, and two mechanisms are provided for effecting this motion, the first being controlled by hand, so as to bring the work to its starting position, and the second being controlled automatically to advance the work with a relatively fast movement during the initial grinding and with a gradually-decreasing speed as the point is approached where the grinding operation should cease, and finally said feeding motion is automatically arrested entirely at the proper point, which may be predetermined by the adjustment of the mechanism and the depth of bevel desired. The feed is controlled through the screw 0, and the mechanism for driving this screw consists of a bevel-gear C on the lower end of the screw, a corresponding bevel-gear 0 mounted on a transverse shaft 0 but through which said shaft 0 may be moved longitudinally. The shaft C carries at one end a hand-wheel C by means of which the shaft may be rotated to adjust the work by hand. At the opposite end of said shaft there is journaled a worm-wheel K, adapted to mesh with a worm K, carried by the shaft K having at its rear end a friction-disk K The connection between the worm-wheel K and shaft 0 is effected through the medium of a clutch C one section of which is connected with the worm-wheelK and the other section of which is mounted on the shaft O and the latter is movable longitudinally by means of a shifting-lever C to throw said clutch-sections into or out of engagement. At the rear of the machine a secondary drive-shaft L is journaled in suitable bearings and .driven by means of a pulley Z, connected by a belt I or otherwise with the main drive-shaft E, and upon this secondary drive-shaft L there is mounted a friction wheel L, which is keyed to said wheel, so as to be capable of a movement longitudinally thereof, but is rotated in unison with said shaft and is adapted to contact with the face of the friction-disk K With such an arrangement it is obvious that if the friction-wheel L be located centrally of the friction-disk K said disk will not be rotated or driventhereby and if said friction-wheel L be moved gradually from its central position toward the periphery of the friction-disk K said disk will be driven with a gradually-decreasing speed-that is to say, whenthe friction-wheel has in moving away from its central position reached a point where it will drive said disk the disk will be given a comparatively rapid rotation; but as the path of travel of the friction-wheel becomes greater and greater the speed of rotation of the friction disk is correspondingly reduced, but with a corresponding increase in the driving power of the wheel and disk.

The movement of the friction-wheel across the face of the disk gives the desired difierential feed, and for moving the said wheel various forms of mechanism may be employed for instance, either the first or second mechanisms described in the contemporaneous application, Serial No. 48,342, series of 1900; but in the present application only the second mechanism referred to is illustrated, as it will be claimed specifically herein.

By reference to the drawings it will be seen that the friction-wheel L is controlled by a lever-arm M, pivoted at the upper end in a bearing M, and this arm is shifted through the medium of a link 0, which at one end is pivotally and preferably adjustably connected with the lever-arm and at the opposite end adjustably connected with a crank 0. Upon the crank a scale for indicating the adjustment is preferably provided. The crank O is carried by a shaft 0 suitably journaled in bearings 0 attached to the main frame, and at itsforward end provided with a bevel gear-wheel 0 adapted to mesh with acorrespending gear-wheel 0 mounted on the end of the shaft 0 but held against longitudinal movement therewith by a clip or collar 0 The shaft 0 being the shaft through which the work-support is elevated, imparts a motion to the crank O exactly proportioned to the elevation of the work-support, and said crank 0 through the link 0 moves the friction-wheel correspondingly and gives the desired differential rate of feed to the work-support, whereby during the initial grinding or when a rough cut may be made and the material of the work removed very rapidly because of the narrowness of the edge, causing said work-support to'move upward quickly, and as the width of the cut increases and it becomes desirable to make a more finished surface the work is fed much slower until as the point of completion is reached the feed is automatically arrested by a mechanism to be now described. iVhile the feed may be arrested by shifting the driving-gear at a number of different points, it is found most convenient to do this work by simply separating the friction-wheel and friction-disk, as in the aforesaidapplication. For this purpose the friction -disk and its shaft are preferably mounted to have a slight longitudinal movement, and they are adapted to be held up to their Work by a fiat spring P, Fig. '1, working between the collars p on the shaft K which carries the friction-disk. Thus when said spring is under tension the disk will be held forward against the friction-wheel L; but if the tension of the spring is relieved the disk and wheel will be separated slightly on the pressure between them be sufficiently relieved to arrest the further feed of the worksupport. The spring is put under tension by means of a gate P pivoted to the main frame and having a set-screw P adapted to bear on the upper end of the spring P, said gate being held forward with the set-screw in contact with the spring by means of a knocker or dog P, which is thrown into position by a spring whenever said gate is swungforwardly, so as to put the spring under tension. The gate is swung forwardly to put the spring under tension by means of a collar P, contacting-with an arm P on the gate, and said collar P is mounted on the shaft 0 and preferably on one of the sections of the clutch 0 whereby Whenever said shaft is moved longitudinally it will put the sections of the clutch into enga ement,the gate will be swung forward, the spring put under tension, and the friction-wheel and disk brought together and held by the dog or knocker P until said dog orknocker is released.

In the ordinary operation of the machine the shaft 0 makes but apartial rotation to feed the work, and hence it is a simple matter to provide a projection onsaid shaft which at the proper instant will contact with the dog or knocker and release the gate, so as to arrest the feed. It will be seen that we have provided the shaft 0 with an adjustable collar P having a projection P on one side thereof which is adapted to contact with the front end of the dog or knocker, so as to release the gate. This collar P may be setat any desired angle with relation to the shaft 0 and secured by a set-screw p to arrestthe' feed when the desired depth of cut or bevel has been made. i As thus far described if power were supplied for rotating the shaft 1-1 the apparatus would operate to grind ellipses or ovals; but owing to the fact that the cen: ter of the work in irregular work of this kind is a shifting center and to the further fact that the grinder must have an appreciable thickness the surface of the grinder on one side or the other of the center will become active and work into or cutaway the ellipse at the four parts intermediate the major and" minor axes. In beveling this results in a bevel of irregular width and narrowest at the major and minor axes. The present apparatusis designed to overcome this diificulty by a compensating movement of the work and grinder with relation to eachother, whereby all portions of the grinder-face will out uniformly and form an accurate ellipse or bevel. As the most convenient and universallyadaptable means for accomplishing the desired end the grinder is given a bodily move ment toward and from thework, such movement being timed-to accord with the rotation of the Work and adjusted to the proportions of the ellipse, oval, or other figure being operated upon. As before stated, the bearings Q, in which the grinder is journaled, are movably mounted on the frame E, being prefer- I ably guided on suitable ways thereon, and each bearing is connected by a connectingrod Q with an adjustable crank q. These cranks are preferably formed by mounting pins adj ustably in transversely-slotted disks q, carried on opposite ends of a transverse shaft Q The shaft Q is rotated by gears R R from the drive-shaft E. The rotary head receives its motion from the shaft H and the latter in turn receives its motion from the main drive-shaft E through the medium of a telescoping diagonal shaft S and bevel-gears S and S the shaft and gears being held in alinement and the gears in mesh by'swivelbearings S adapted to permit the adjustment or feed movements of the work-support or frame E without interference. Obviously the necessary movement is a relative movement of the rotary head and grinder, and hence instead of moving the grinder bodily the rotary head might be given a bodily movement toward and from the grinder-as, for instance, by mounting the shaft H, rotary head, and parts cooperating therewith on a slide receiving motion from an adjustable cam or crank and operating in proper relation to the rotation of the head. By adjusting the throw of the cranks q the extent of bodily movement of the stone may be regulated to grind ellipses of any desired proportions, and by varying the speed of rotation of the head and movement of the stone other irregular shapes may be ground with equal facility.

Having thus described ourinvention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a grinding-machine for curved work the combination of the following instrumentalities, to wit: a rotary grinder, a rotary head, driving mechanism for simultaneously rotating and moving said grinder and head toward and from each other, a work-support mounted on said head to rotate in unison therewith and movable independently thereof toward and from the grinder and an eccentric for moving the support independently; substantiallyas described.

2. In a beveling-machine for curved work the combination of the following instrumentalities, to wit: a rotary grinder, movable transversely of its axis of rotation, a rotary head, driving mechanism for simultaneously rotating said head and periodically moving the grinder transversely of its axis and a worksupport mounted on said head to rotate in unison therewith; substantially as described.

3. In a beveling-machine, the combination of the following instrumentalities, to wit: a rotary grinder, bearings in which the grinder is journaled movable in a plane at right an-' gles to the axis of rotation, a drive-shaft, driving connections between said shaft and bearings in which the grinder is journaled for periodically moving the grinder bodily transversely of its axis during the grinding operation, a rotary support for the work presented to the grinder and driving mechanism for rotating said support; substantially as described.

4. In a beveling-machine, the combination with a rotary grinder, a pivoted grinderframe and bearings in which the grinder is mounted movably supported in said frame whereby the grinder may be given a bodily movement independent of the frame, of a driving-gear connected with said bearings for giving the grinder a periodic bodily movement, a rotary support for the work presented to the grinder and driving connections between the work-support and driving mechanism for moving the grinder; substantially as described.

5. In a beveling-machine, the combination with a rotary grinder, a pivoted grinderframe, hearings in which the grinder is mounted movable toward and from the axis of the frame, of a drive-shaft, gearing intermediate the shaft and grinder for rotating the latter, gearing intermediate the shaft and bearings for moving the grinder toward and from the axis of the frame, a rotary work-support and gearing intermediate said work-support and shaft for rotating the support; substantially as described.

6. In abeveling-machine, the combination with a rotary work-support and driving-gearing for rotating said support, of a rotary grinder movable bodily toward and from the support, an adjustable crank for moving said grinder bodily and gearing for moving said crank timed to move said crank in unison with the rotation of the Work-support; substantially as described.

7. In a beveling-machine, the combination with the rotary work-support and gearing for rotating the same, ofa pivoted frame agrinder journaled in bearings movable on said frame, an adjustable crank for moving said bearings, and a driving-gearing for moving said bearings in a predetermined ratio to the rotation of the work-support; substantially as described.

8. In a beveling-machine, the combination with a rotary work-support, a driving mechanism for rotating the same and means for moving the-support vertically, of a bodilymovable. rotary grinder, a driving mechanism for moving the grinder bodily at predetermined intervals and a driving mechanism for rotating the grinder; substantially as described.

9. In a beveling-machine, the combination with a rotary grinder, a vertically-movable rotary work-support and means for moving said support vertically, of a driving-gear for rotating said support embodying a telescoping shaft whereby the same may accommodate itself to the vertical adjustment of the support; substantially as described.

10. In a beveling-machine, the combination with a rotary grinder, vertically movable work-support and a driving mechanism for moving said work-support vertically embodying a friction-disk and a friction-Wheel movable transversely of said friction-disk, of a shifting mechanism for said friction-wheel embodying a shifting arm and a crank connected therewith and controlled in its angular position by the vertical position of the worksupport; substantially as described.

11. In a beveling-machine, the combination with a rotary grinder, vertically movable work-support, and a driving mechanism for moving said work-support vertically embodying a friction-disk and a friction-wheel movable transversely of said friction-disk, of a shifting mechanism for said friction-wheel embodying a shifting arm and an adjustable crank connected therewith and controlled in its angular position by the vertical position of the work-support; substantially as described.

determined by the position of the shaft and work-support; substantially as described.

CHARLES L. GOEHRING. WILLIAM TROOHE.

' Witnesses:

H. S. FALOR, PHEBE FALOR. 

